unbelievably stupid mistake - i broke /usr/lib need help

[Alastair McKinley]

Hi everyone,

I made a really daft mistake and deleted a lot of files in /usr/lib.  Im 
not sure how many I have deleted.

I was trying to delete a linux rootfs on an SD and thought I was in 
/media/usbdisk/usr/lib, clearly I wasnt.
You would think I should know better this is at least the third time I 
have done something like this.

My laptop is still up and running, can anyone give me any ideas on a way 
to fix all my broken libraries?

Can yum do it?

Please help me!

Best regards,

Alastair